November 1, 2017 10:00 pm / 11:00 pm

43-105 CHS (Center for Health Sciences)

About the lecture: The California Air Resources Board (CARB) has developed a roadside plume capture emissions measurement platform to measure emissions snapshots of passing heavy-duty vehicles. Over the past 10 years emissions regulations have required Heavy-Duty Diesel Vehicle (HDDV) manufacturers to reduce engine out particulate matter (PM) and nitrogen oxides (NOx) emissions. As regulations have decreased the HDDV fleet emissions of these key pollutants, vehicles with malfunctioning or mal-maintained engines and/or after-treatment systems will emit disproportionally higher amount of PM and NOx. This Portable Emission AcQuisition System (PEAQS) is a measurement platform that captures a portion of the emissions from passing vehicles and calculates a fuel specific emission snapshot (g pollutant / kg fuel burned).
This presentation will discuss the design of a prototype measurement platform that can characterize emissions from HDDVs with either upward or downward facing exhaust stacks and initial pilot testing conducted at the California Department of Food and Agriculture (CDFA) inspection station in Truckee, CA. This pilot system is capable of quantifying emissions factors for black carbon (BC; a large fraction of diesel PM) and total NOx. The quantification of all exhaust orientation of HDDV is needed for an accurate evaluation of the fleet. Statewide deployment of PEAQS will allow CARB to monitor fleet emissions and screen for higher emitting vehicles in real-time as part of the broader CARB mission to further reduce tailpipe emissions.
About the speaker:
Dr. Tao Huai is Chief of Freight Emissions Assessment and Research Branch in the Monitoring & Laboratory Division at the California Air Resources Board. Dr. Huai has extensive experience working in the field of vehicle emissions research and AB32 GHG regulation development, with nearly 10 years at ARB. He is currently responsible for developing a comprehensive and unified emissions testing and research program for heavy-duty trucks and other freight related sources to support ARB’s mobile source regulatory programs and sustainable freight strategies. His scientific contributions include more than two dozen peer-reviewed journal publications and various invited technical presentations.
For more information please contact Rebecca Greenberg at or at (310) 206-1619